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DURO-LAST ROCK-PLY MEMBRANE

Membrane Attachment:
Mechanically Fastened – Rock-Ply membrane may be mechanically attached to a variety of roof deck and wall
materials. An appropriate slip sheet or cover board may be required. Refer to the Roll Good Mechanically
Fastened Systems Specification for system requirements.
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Duro-Bond System – The Duro-Bond system (induction weld) may be used to attach Rock-Ply membrane.
Refer to the Duro-Last Duro-Bond System Specification for system requirements.
Adhered – Rock-Ply membrane may be adhered to a variety of properly prepared roof decks, walls, cover
boards and insulations. Refer to the Duro-Last Adhered Systems Specification for system requirements.

Physical Properties:
Rock-Ply membrane has been subjected to the tests required by ASTM 4434 “Standard Specification for Poly
(Vinyl Chloride) Sheet Roofing” and has been classified as a Type III, internally reinforced sheet. The results of
each test are listed below. ASTM’s Overall Thickness requirements for the membrane are plus or minus 10%
(nominal) of the listed Typical Value.
Physical Property Test Method ASTM D4434 Requirement Result Typical Value
 0.045 and ≤ 0.055 in.
Overall Thickness ASTM D751 PASS 0.050 in. (50 mil), nominal
( 45 and ≤ 55 mil)
Thickness Over Scrim ASTM D7635  0.016 in. PASS 0.021 in. (21 mil)
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Breaking Strength ASTM D751 Grab Method  200 lbf./in. PASS 390 x 438 lbf./in.
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Elongation ASTM D751 Grab Method  15% PASS 31% x 31%
 328 lbf.
Seam Strength ASTM D751 Grab Method PASS 417 lbf.
(75% of Breaking Strength.)
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Tear Strength ASTM D751 Procedure B  45 lbf. PASS 132 x 163 lbf.
Low Temp. Bend ASTM D2136 Must pass at -40 F PASS PASS
Conditioned for 56 days in oven
Heat Aging ASTM D3045 PASS PASS
maintained at 176 F.
5,000 hours total test time.
ASTM G154 Irradiance level of 0.68 W/m2-nm.
Accelerated Aging PASS PASS
(Formerly G53) Cycle: 8 hours at 145 F,
4 hours condensation at 122 F.
Conditioned for 6 hours in oven
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Dimensional Stability ASTM D1204 maintained at 176 F. PASS -0.30% x -0.45%
Allowable change: ≤ 0.5%
Immersed in water at 158 F
Water Absorption ASTM D570 for 168 hours. PASS 1.7%
Allowable weight change: ≤ 3%
Static Puncture ASTM D5602  33 lbf. PASS 56 lbf.
Dynamic Puncture ASTM D5635  14.7 ft-lbf. (20 J) PASS  14.7 ft-lbf. (20 J)
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Typical values are shown for both machine and cross machine directions. The machine direction results are listed first.
Additional Tests

Fungi Resistance ASTM G-21 No sustained growth or discoloration
Moisture Vapor Transmission ASTM E96, Proc. B, Method A < 0.35 U.S. perms

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Duro-Last, “World’s Best Roof”, Rock-Ply and Duro-Bond are registered trademarks owned by Duro-Last, Inc.
Created: 08/01/2008 Revised: 02/25/2013, 07/29/2014, 05/18/2015, 02/15/2016